test: Add stroke-open-box

Add a new test to check that the stroking of a 3-sided box is not
"optimized" to a 4-sided box.

Test case based on the code by Simon Kellner in
https://bugs.freedesktop.org/show_bug.cgi?id=34560

test/Makefile.am

@@ -1230,6 +1230,7 @@ REFERENCE_IMAGES = \
 	stroke-image.quartz.ref.png \
 	stroke-image.ref.png \
 	stroke-image.xlib.ref.png \
+	stroke-open-box.ref.png \
 	subsurface.ref.png \
 	subsurface.image16.ref.png \
 	subsurface.ps.ref.png \

test/Makefile.sources

@@ -226,6 +226,7 @@ test_sources = \
 	scaled-font-zero-matrix.c			\
 	stroke-ctm-caps.c				\
 	stroke-image.c				        \
+	stroke-open-box.c				\
 	select-font-face.c				\
 	select-font-no-show-text.c			\
 	self-copy.c					\

test/stroke-open-box.c

@@ -0,0 +1,51 @@
+/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
+/*
+ * Copyright 2011 Simon Kellner
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * Author: Simon Kellner <kellner@kit.edu>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_set_source_rgb (cr, 0, 0, 0);
+    cairo_move_to (cr, 5, 7);
+    cairo_rel_line_to (cr, 20, 0);
+    cairo_rel_line_to (cr, 0, 15);
+    cairo_rel_line_to (cr, -20, 0);
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (stroke_open_box,
+	    "Tests stroking of a 3-sided box",
+	    "stroke,box", /* keywords */
+	    NULL, /* requirements */
+	    30, 32,
+	    NULL, draw)